netdev - Re: [PATCH v3 bpf-next 17/18] selftests/bpf: add map linking selftest

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Date:   Fri, 23 Apr 2021 14:39:34 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Yonghong Song <yhs@...com>, Andrii Nakryiko <andrii@...nel.org>,
        bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH v3 bpf-next 17/18] selftests/bpf: add map linking selftest

On Fri, Apr 23, 2021 at 2:23 PM Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
>
> On Fri, Apr 23, 2021 at 11:54 AM Yonghong Song <yhs@...com> wrote:
> >
> >
> >
> > On 4/23/21 11:13 AM, Andrii Nakryiko wrote:
> > > Add selftest validating various aspects of statically linking BTF-defined map
> > > definitions. Legacy map definitions do not support extern resolution between
> > > object files. Some of the aspects validated:
> > >    - correct resolution of extern maps against concrete map definitions;
> > >    - extern maps can currently only specify map type and key/value size and/or
> > >      type information;
> > >    - weak concrete map definitions are resolved properly.
> > >
> > > Static map definitions are not yet supported by libbpf, so they are not
> > > explicitly tested, though manual testing showes that BPF linker handles them
> > > properly.
> > >
> > > Acked-by: Yonghong Song <yhs@...com>
> > > Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
> > [...]
> > > +
> > > +SEC("raw_tp/sys_exit")
> > > +int BPF_PROG(handler_exit1)
> > > +{
> > > +     /* lookup values with key = 2, set in another file */
> > > +     int key = 2, *val;
> > > +     struct my_key key_struct = { .x = 2 };
> > > +     struct my_value *value_struct;
> > > +
> > > +     value_struct = bpf_map_lookup_elem(&map1, &key_struct);
> > > +     if (value_struct)
> > > +             output_first1 = value_struct->x;
> > > +
> > > +     val = bpf_map_lookup_elem(&map2, &key);
> > > +     if (val)
> > > +             output_second1 = *val;
> > > +
> > > +     val = bpf_map_lookup_elem(&map_weak, &key);
> > > +     if (val)
> > > +             output_weak1 = *val;
> > > +
> >
> > There is an extra tab in the above line. There is no need for new
> > revision just for this. If no new revision is needed, maybe
> > the maintainer can help fix it.
>
> Sorry. I applied without it. Pls fold the fix in some of the future patches.

Ok, no problem, I'll do it in v3 of statics support patch set.